Motorola GTX Page 63 Service Manual Download

Page: 63 / 84

8-6

Troubleshooting

Troubleshooting Flow Chart
for Power Amplifier

START

Yes

Is PA control

Is Red light on?

Is control head

Is K9.1 OK?

Go to

Go to controller

Is there

Faulty power setting DAC

Faulty coupler.

Check R6519, U0701,

Faulty current sense

Faulty integrator.

Faulty REF voltage.

Is RF at

Are voltages

Is RF

Is RF after

Replace Antenna

Check CR6501, Q6506,

Check U6502, R6520,

Replace U6501.

Check CR6502, CR6503,

Check L6513, L6513,

Is there 5V at

Go to synthesizer

PA RF SECTION FAULT

PA LOGIC SECTION FAULT

Levels were measured with an

RF probe in series with 0.5pF

Is synt out

Go to controller

*U6501 DC voltages:

Pin 2: 9.1V (during Tx only)

Pins 3 and 4: A+-0.1V

Yes

OK?

control head

troubleshooting.

5V at

Is there

K9.1 ENB?

troubleshooting.

9.3V at Q0741

or Q0742?

Replace
Q0741 and Q0742.

synthesizer
troubleshooting.

troubleshooting.

PA_ENABLE?

(PA_PWR_SET)

at U0702-2

there ~2V

or software

Is there ~ OV at

U0701-7?

Check CR6509, R6515,
CR6506, R6514, L6516,
R6512.

L6515, R0725, R0721,

R0722, R0723.

mechanism. Check
R6520, U0701 DAC
(U0702-11).

Check R0251, R0252,
U0251.

Replace U0701.

connector.

Harmonic Filter

at ~23dBm?

C6543.

CR6504, R6538, R6539,
R6537.

L6519, L6504 ,L6505,
L6506,VR6501.

Q6501, L6503, L6502.

troubleshooting.

U6501
~2dBm?

>2dBm?

at ~0V?

at U6501*

OK?

output ~24dBm?

at U6501

Tx switch

at ~24dBm?

U0701-14
at <4.5V?

U0701-1

at <4.5V?

U0701-10

~4.6V?

capacitor.

Summary of Contents for GTX

Page 1: ...GTX LCS 2000 Mobile Radio Service Manual 6802945C70 68P02945C70 O Motorola Inc 8000 West Sunrise Boulevard Fort Lauderdale Florida 33322 9934 ...

Page 2: ...odification of FM approved intrinsically safe radios will negate Factory Mutual Research Corporation FMRC approval Manual Revisions Changes which occur after this manual is printed are described in FMRs These FMRs provide complete infor mation on changes including pertinent parts listing data Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motoro...

Page 3: ...odification of FM approved intrinsically safe radios will negate Factory Mutual Research Corporation FMRC approval Manual Revisions Changes which occur after this manual is printed are described in FMRs These FMRs provide complete infor mation on changes including pertinent parts listing data Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motoro...

Page 4: ...1 1 Scope of this Manual 1 1 Safety information 1 1 Air Bag Warning 1 2 LP Gas Warning 1 2 Section 2 Basic Maintenance Introduction 2 1 Preventive Maintenance 2 1 Inspection 2 1 Cleaning 2 1 Plastic Surfaces 2 1 Circuit Boards and Components 2 1 Safe Handling of CMOS Devices 2 2 Precautions 2 2 Repair Procedures and Techniques 2 3 Parts Replacement 2 3 Rigid Circuit Boards 2 3 Chip Components 2 3 ...

Page 5: ...e the Radio 5 4 Assemble the Control Head 5 4 Replace the Main Board 5 4 Replace the Top Cover and Control Head 5 4 Section 6 Radio Tuning Procedure Radio Tuning Procedure 6 1 General 6 1 Tuning Procedure 6 3 Starting the Tuning Procedure 6 3 Reference Crystal Data 6 3 Tx Power 6 3 Reference Oscillator Alignment 6 3 Transmitter Power 6 3 Transmit Deviation Balance Compensation Deviation Limit 6 4 ...

Page 6: ... 14 General 7 14 Audio Signalling Filter IC ASFIC 7 14 Audio Ground 7 14 Transmit Audio Circuits 7 14 Mic Input Path 7 14 External Mic Path 7 15 PTT Sensing and TX Audio Processing 7 15 Transmit Signalling Circuits 7 16 Sub audible Data PL DPL 7 16 High Speed Data 7 17 Dual Tone Multiple Frequency DTMF Data 7 17 Receive Audio Circuits 7 18 Squelch Detect 7 18 Audio Processing and Digital Volume Co...

Page 7: ...or FLF5582A Main Board Controller Section Logic Sub section 7 Schematic Diagram for FLF5582A Main Board Controller Section Audio I O Regulator Sub sections 8 Circuit Board Details for FLF5582A Main Board 9 Parts List for FLF5582A Main Board 10 Schematic Diagram for FLN8530A Control Head 13 Circuit Board Details Parts List for FLN8530A Control Head 14 GTX Exploded View Mechanical Parts List 15 LCS ...

Page 8: ...ol Head FHN5875 Accessory Kit FUF1290 15 W Unified Chassis FCN1629 Control Head FLN8530 Control Head FLN8531 Control Head Hardware FUF1290 15 W Unified Chassis FLF5582 Main Board FLN8529 Main Board Hardware GTX Options Delete Options B90 All Accessories except microphone B71 Standard Mic HMN3413 Compact Mic B161 Standard Power Cable 10 A Fuse GKN6270 B65 Standard Non Locking Mounting Bracket GLN73...

Page 9: ...e GKN6271 Ignition Switch Cable GKN6272 External Alarm Relay and Cable Antennas RRA4914 3 dB Gain Roof Mount RRA4983 3 dB Gain Roof Mount with Teflon Cable HAF4002 1 4 Wave Roof Mount Accessory Connectors HLN5282 Mini U Connector HKN9557 Mini U Antenna Adapter Cable HLN8027 Mini U to BNC Adapter Documentation Kits User Guides Operator Manuals 68P02946C85 Quick Start 68P02946C75 User s Manual Insta...

Page 10: ...530 Control Head FLN8544 Control Head Hardware FUF1290 15 W Unified Chassis FLF5582 Main Board FLN8529 Main Board Hardware LCS 2000 Options Microphones B382 ALT Full Size Mic B20 ALT Full Size DTMF Non Backlit Touch Code Mic Speaker B18 7 5 W External Speaker Alarms B221 ADD External Alarm Relay and Cable B668 ADD Emergency Pushbutton Alarm and Cable B674 ADD Emergency Footswitch Alarm and Cable D...

Page 11: ...arm Relay Cable HLN9329 Emergency Pushbutton GLN7323 Emergency Footswitch Antennas RRA4914 3 dB Gain Roof Mount SS Antenna RRA4990 3 dB Gain Roof Mount BC Antenna RRA4983 3 dB Gain Roof Mount LL SS Antenna RRA4986 3 dB Gain Roof Mount LL BC Antenna HAF4002 1 4 Wave Roof Mount Accessory Connectors HLN5282 Mini U Connector HKN9557 Mini U Antenna Adapter Cable HLN8027 Mini U to BNC Adapter Documentat...

Page 12: ...ansmit 15 W Off 13 6 V 10 8 to 16 3 V 0 45 A 1 7 A with 7 5 W 6 5 A 30 mA Adj Channel Selectivity 65 dB Deviation Max GTX 806 821 851 866 MHz LCS 2000 821 825 866 870 MHz 5 kHz 4 kHz Number of Systems Talkgroups Conventional 10 8 10 Spurious Image Rejection 65dB Spurious Harmonics 56 dBc Channel Spacing 25 kHz Intermodulation 65dB Audio Response 6 dB octave 1 3 dB at 300 3000 Hz Mode of Operation ...

Page 13: ...kage Position 12 Position 10 Feature Level Position 8 Primary Operation Position 11 Version Position 9 Primary System Type 806 870 MHz 10 25 W Standard Control with Display Position 7 Channel Spacing 20 25 kHz Unique Model Variations Standard Package Version Letter Alpha Major Change Basic Privacy Plus Trunked Twin Type M 1 0 U G D 6 D C 5 A N Position 1 Type of Unit M Mobile Model Number Position...

Page 14: ...hen transmitting radiates energy into the atmosphere which may under certain conditions causes the generation of a spark All users of vehicles fitted with radios should be aware of the following warnings WARNING Indicates a potentially hazardous situation which if not avoided COULD result in death or serious injury CAUTION Indicates a potentially hazardous situation which if not avoided MAY result...

Page 15: ...lways obey them Also when using your radio while driving please give full attention to driving use hands free operation if available and pull off the road and park before making or answering a call if driving conditions so require WARNING Vehicles equipped with air bags An air bag inflates with great force Do not place objects including communication equipment in the area over the air bag or in th...

Page 16: ...eaned only when the radio is disassembled for servicing or repair The only recommended agent for cleaning the external radio surfaces is a 0 5 solution of mild dishwashing detergent in water the only factory recommended liquid for cleaning the printed circuits boards and their components is isopropyl alcohol 70 by volume Plastic Surfaces The detergent solution should be applied sparingly with a st...

Page 17: ...ose hanging neckties 3 Store and transport all static sensitive devices in ESD protective containers 4 If at all possible handle CMOS devices by the package and not by the leads Prior to touching the unit touch an electrical ground to remove any static charge that you may have accumulated The package and substrate may be electrically common If so the reaction of a discharge to the case would cause...

Page 18: ...fice Rigid Circuit Boards This family of radios uses bonded multi layer printed circuit boards Since the inner layers are not accessible some special considerations are required when soldering and unsoldering components The printed through holes may interconnect multiple layers of the printed circuit When soldering near the 16 or 18 pin connector use care to avoid accidentally getting solder in th...

Page 19: ...eping the heat focus head approximately 1 8 0 3cm above the printed circuit board when removing or replacing the device OMPAC Removal To remove the OMPAC select the R 1070A Air Flow Station and the appropriate heat focus head approximately the same size as the OMPAC Attach the heat focus head to the chimney heater Adjust the temperature control to approximately 415 F 215 C 445 F 230 C maximum Adju...

Page 20: ... vacuum pump Lower the focus head until it is approximately 1 8 0 3cm above the shield Turn on the heater and wait until the shield lifts off the circuit board Once the shield is off turn off the heat grab the part with a pair of tweezers and turn off the vacuum pump Remove the circuit board from the R 1070A s circuit board holder Shield Replacement To replace the shield add solder to the shield i...

Page 21: ...2 6 Basic Maintenance This Page is Intentionally Left Blank ...

Page 22: ...que item or no substitution is recommended Table 3 1 Recommended Test Equipment Model No Description Characteristics Application R2000 Series with trunking option Communications System Analyzer Frequency deviation meter and signal generator for wide range troubleshoot ing and alignment R1053 Dual Trace Oscilloscope 200 MHz bandwidth 5 mV cm 20 Mv cm For waveform measurements FLUKE 8012 Digital Mul...

Page 23: ...AC 3080070N01 Combined Interface Cable Connects radio to RLN4008B RIB GKN6270A DC Power Cable for radio Interconnects radio to power supply 3080369B72 Computer Interface Cable Connects the computer s serial communications adapter 9 pin to the RIB 3080369B71 Computer Interface Cable Connects the computer s serial communications adapter 25 pin to the RIB RLN4438A Adapter 25 pin F to 9 pin M adapter ...

Page 24: ...cc plastic syringe and flux paste For use with flux holder applicator 8180369E97 0180386A81 Miniature digital read out soldering station includes 1 64 micropoint tip 0180386A78 Illuminated magnifying glass with lens attachment 0180386A82 Anti static grounding kit Used during all radio assembly and disassembly procedures 6684253C72 Straight prober 6680384A98 Brush 1010041A86 Solder RMA type 63 37 0...

Page 25: ...3 4 Test Equipment Service Aids and Tools This Page is Intentionally Left Blank ...

Page 26: ...tes One beep is heard to indicate operation on the first test frequency default Display shows 4 1 Test Mode Channel Selection Use the PTT switch for channel selection A short press and de press on the PTT switch button like push will advance the radio to the next channel cyclical Seven channels are available during test mode as shown in the table below 1 CC1 CC4 are control channels programmed in ...

Page 27: ...gal tone is heard For error no 8 the temporary illegal tone is heard See the Quick Start card for instructions on how to change personality To exit fail mode power radio off Non critical errors will be temporarily indicated as described in the table above Exiting Test Mode To exit Test Mode proceed as follows Turn radio off Turn RIB on Turn radio on Modulation Type Internal Speaker Audio Signaling...

Page 28: ... 1 Turn the radio upside down 2 Insert a small flat blade screw driver or similar in the recess between the control head and the main board 3 Press until the side of the control head releases 4 Pull the control head away from the main board 5 Remove the flat cable from the socket on the radio side Figure 5 1 Control Head Removal Figure 5 2 Flat Cable Removal CONTROL HEAD RECESS not visible ...

Page 29: ...wall and gently prying the clip upwards 2 Remove the 3 screws of the PA shield using a T8 TORX driver Remove the PA shield by gently prying up each corner of the shield 3 Remove the 8 screws securing the main board to the radio chassis 4 Carefully remove the main board by rotating it out of the chassis 5 Slowly lift the board on the front edge the side with the connector that mates with the contro...

Page 30: ... head housing 2 Disconnect the board from the speaker by removing it from the socket 3 Remove the keypad from the control head housing by lifting it up from the board Care should be taken not to touch or get other contaminates on the conductive pads on the under side of the keypad or conductive contacts on the printed circuit board 4 Take the LCD frame out of the control head CLIPS SHIELD TAB KEYP...

Page 31: ...rcuit board ensure the four protruding tabs snap into the recesses Replace the Main Board 1 Inspect and if necessary reapply thermal grease to the heatsink ing pads in the chassis 2 Install the 8 screws with 0 4 07 NM 4 6 in lbs of torque using a T8 TORX driver 3 Before installing the connector retaining clips ensure that the board is sitting flush on the chassis mounting surface 4 Install the PA ...

Page 32: ...st Set as shown in Figure 6 6 Figure 6 6 Radio Alignment Test Setup BNC RIB RIB POWER SUPPLY COMPUTER INTERFACE CABLE DATA GND COMPUTER AUDIO GENERATOR SINAD METER AC VOLTMETER TX RX 30 dB PAD 30 dB PAD RF GENERATOR SERVICE MONITOR WATTMETER TRANSMIT RECEIVE TEST SET RADIO PROGRAM or AUDIO IN SMA BNC TEST CABLE 15 PIN 25 PIN Note Battery can be used in RIB MIC IN or COUNTER 0180357A57 110 V USA RL...

Page 33: ...m maximum and proposed value of the softpot as shown in Figure 6 8 Figure 6 8 Softpot Concept CAUTION Do NOT switch radios in the middle of any SERVICE procedure Always use the EXIT key to return to the MAIN menu screen before disconnecting the radio Improper exits from the SERVICE screens may leave the radio in an improperly configured state and result in seriously degraded radio or system perfor...

Page 34: ...will interfere with other users operating on adjacent channels For this reason the reference oscillator should be checked every time the radio is serviced The frequency counter used for this procedure must have a stability of 0 1 ppm or better 1 Press F4 to select the REFERENCE OSCILLATOR softpot 2 Press F6 to key the radio The screen will indicate that the radio is transmitting 3 Measure the tran...

Page 35: ...mit deviation limit softpot sets the maximum deviation of the carrier Tuning is performed for 25 kHz channel spacing 1 Begin with the lowest test frequency shown on the screen 2 Press F6 to key the radio 3 With Test Box 4460A inject a 1 kHz tone 2000 mVrms 4 Use the UP DOWN arrow keys to adjust the deviation to between 4 4 kHz and 4 8 kHz 5 Press ENTER to move to the next softpot value 6 Repeat st...

Page 36: ...s The main radio is a single board design consisting of the transmitter receiver and controller circuits The control head is mounted directly on the front of the radio The control head contains a speaker LED indicators a microphone connector buttons which provide the user with interface control over the various features of the radio and a display In addition to the power cable and antenna cable an...

Page 37: ...iting diodes D5303 placed in front of RF preamplifier Q5301 The hot carrier diodes limit strong signals to prevent them from overdriving the RF preamplifier and damaging it The front end amplifier is a low noise amplifier that consists of Q5301 Its main purpose is to set the noise figure of the receiver The front end amplifier as well as the IF amplifiers are shut off during transmit by K9 1 line ...

Page 38: ...he IF amplifier is a matching network that matches the IF amplifier output impedance to the input impedance of a second 45 1 MHz crystal filter Y5202 The second crystal filter is followed by matching elements that match the output of the second crystal filter to the input of the receiver back end circuits After the matching circuit the signal passes a pair of hot carrier limiting diodes D5201 plac...

Page 39: ... by the K9 1 line through switch U6502 which connects the A line to pin 2 of U6501 when transmit is enabled The RF drive which is routed into transistor Q6501 is controlled from Q6506 via the PA control line The rising control voltage on the PA control line causes a rising collector voltage on Q6501 This causes more power out of the stage Conversely a decreasing control line voltage decreases the ...

Page 40: ... the radio from damage This diode also provides transient over voltage protection by breaking down when the supply voltage to the radio exceeds 24 V Power Control Circuitry The power control circuitry consists of three mechanisms Power Set The control loop compares the power output level to the pre set value The VFORWARD voltage from the forward power detector is amplified by U0701 pins 5 and 7 an...

Page 41: ...ed by pulling pin 1 high on U5702 The buffer stage U5701 and the feedback amplifier Q5703 provide the necessary gain and isolation for the synthesizer loop Fractional N Synthesizer IC U5702 consists of Prescaler Programmable loop divider Control divider logic Phase detector Charge pump A D Converter for low frequency digital modulation Balance attenuator to balance the high and low frequency analo...

Page 42: ...702 The A D converter will convert the low frequency analog modulating signal into a digital code that will in turn be applied to the loop divider This will cause the carrier to deviate The balance attenuator is used to adjust the VCO deviation sensitivity to high frequency modulating signals The output of the balance attenuator is present at the MODOUT port pin 28 of U5702 The transmit injection ...

Page 43: ...output pin 5 that drops to 0 V while the regulator output goes out of regulation This is used to reset the controller in order to prevent improper operation Diode D0631 prevents discharge of C0632 by negative spikes on the 9V3 voltage Regulator U0601 is used to generate the 9 3 V required by some audio circuits the RF circuitry and power control circuitry Input and output capacitors C0601 0603 and...

Page 44: ...is pulled high by R0442 This causes the collector of transistor Q0441 to drop down 0 2 V thereby setting the EMER IGN SENSE line to low While EMERGENCY CONTROL is low Q0611 is turned on SW B is enabled the microprocessor starts execution reads the voltage level of EMER IGN SENSE line and sets the B CONTROL output of the ASFIC to a logic high This high level keeps Q0611 switched on through Q0612 Th...

Page 45: ...zer The ASFIC in addition to audio circuitry has a programmable synthesizer which can generate a synthesized signal ranging from 1200 Hz to 32 769 MHz with steps of 1200 Hz While the radio is turned on the ASFIC generates a default 3 6864 MHz CMOS square wave µP CLK on U0201 UPCLK which is routed to the µP U0101 EXTAL After the µP starts operation it reprograms the ASFIC synthesizer clock to a hig...

Page 46: ...e 768 bytes of internal RAM and 640 bytes of internal EEPROM as well as glue logic circuitry to select external memory ICs The external EEPROM U0104 as well as the K1µP s own internal EEPROM contain the radio information which is customer specific referred to as the codeplug This information consists of items such as 1 frequency operating band 2 channel frequencies and 3 general tuning information...

Page 47: ...be converted to digital values of 140 to 217 respectively U0101 51 is the high reference voltage for the A D ports on the K1µP Resistor R0106 and capacitor C0106 filter the 5 V reference If this voltage is lower than 5 V the A D readings will be incorrect Likewise U0101 50 is the low reference for the A D ports This line is normally tied to ground If this line is not connected to ground the A D re...

Page 48: ...le for user interface The Control Head contains the internal speaker the microphone connector several buttons to operate the radio and several indicator LEDs to inform the user about the radio status Additionally Control Head P uses a 3 digit LCD display for the channel number When turned on the On Off switch switches the voltage regulators on by pulling ON OFF CONTROL to high and connects the bas...

Page 49: ...o the Audio Signalling Filter IC ASFIC U0251 forms this bias by dividing 9 3V with resistors R0251 R0252 and buffering the 4 65V result with a voltage follower VAG emerges at pin 1 of U0251 C0235 is a bypass capacitor for VAG The ASFIC generates its own 2 5V bias for its internal circuitry C0221 is the bypass for the ASFIC s audio ground dc bias Note While there are ASFIC VAG and BOARD VAG U0201 1...

Page 50: ...r the internal mic audio path and external PTT will result in the external mic audio path being selected for models with separated MIC and EXT MIC signals Inside the ASFIC the mic audio is filtered to eliminate components outside the 300 3000Hz voice band pre emphasized if pre emphasis is enabled The capacitor between ASFIC pre emphasis out U0201 C8 and ASFIC limiter in U0201 E8 AC couples the sig...

Page 51: ...n and connect tones for trunked voice channel operation The trunking connect tone is simply a PL tone at a higher deviation level than PL in a conventional system Although it is referred to as sub audible data the actual frequency spectrum of these waveforms may be as high as 250 Hz which is audible to the human ear However the radio receiver filters out any audio below 300Hz so these tones are ne...

Page 52: ...o the RF board MPT 1327 and MDC are generated in much the same way as Trunking ISW However in some cases these signals may also pass through a data pre emphasis block in the ASFIC Also these signalling schemes are based on sending a combination of 1200 Hz and 1800 Hz tones only Microphone audio is muted during High Speed Data signalling Dual Tone Multiple Frequency DTMF Data DTMF data is a dual to...

Page 53: ...0201 H1 The squelch signal entering the ASFIC is amplified filtered attenuated and rectified It is then sent to a comparator to produce an active high signal on CH ACT A squelch tail circuit is used to produce SQ DET U0201 H1 from CH J0400 11 16 1 FLAT RX AUDIO EXTERNAL INTERNAL ACCESSORY CONNECTOR CONTROL HEAD CONNECTOR HANDSET 14 1 2 J0101 INT SPKR SPKR 1 9 ATTEN H6 J7 J6 DET AUDIO H7 J4 B2 INT ...

Page 54: ...set depending on the value of the volume control Finally the filtered audio signal passes through an output buffer within the ASFIC The audio signal exits the ASFIC at RX AUDIO U0201 J4 The µP programs the attenuator using the SPI BUS based on the volume setting The minimum maximum settings of the attenuator are set by codeplug parameters Since sub audible signalling is summed with voice informati...

Page 55: ...C bias which varies proportionately with FLT A U0401 7 FLT A of 11V yields DC offset of 5V and FLT A of 17V yields a DC offset of 8 5V If either of these lines is shorted to ground it is possible that the audio PA will be damaged SPK and SPK are routed to the accessory connector J400 16 and 1 and to the control head connector J0101 1 and 2 Handset Audio Certain hand held accessories have a speaker...

Page 56: ...es one bit every clock cycle The external capacitors C0226 C0225 and C0223 set the low frequency pole for a zero crossings detector in the limiters for PL and HS data The hysteresis of these limiters is programmed based on the type of received data Note During HS data the µP may generate a sampling waveform seen at U0201 G1 Alert Tone Circuits When the software determines that it needs to give the...

Page 57: ...ate any tone within the 100 3000Hz audio band This is accomplished by the µP generating a square wave which enters the ASFIC at U0201 C3 Inside the ASFIC this signal is routed to the alert tone generator the output of the generator is summed into the audio chain just after the RX audio de emphasis block Inside U0201 the tone is amplified and filtered then passed through the 8 bit digital volume at...

Page 58: ...roubleshooting Overview This section contains three troubleshooting tables for the following GTX LCS 2000 components Receiver Synthesizer Power Amplifier Controller Control Head Troubleshooting Charts Refer to following pages ...

Page 59: ...ted have No Yes Yes Yes No No No Replace Yes Yes No Yes No DC circuit logic circuit Rx Tx switch synthesizer controller circuit Y5201 Q5201 Y5202 U5211 Q5301 level level on L5401 present on R5302 Circuit present at AC level 0 2Vrms 1KHz End Y5202 3 Y5202 1 45 1MHz present at U5211 5 No TP10 at 0V 50dBm a tolerance of 10 NOTE level Is present at RF_REG_5V Q5320 E 2 Yes Yes Yes Y5201 3 present on pr...

Page 60: ...RF level Is RF level Check Check FL5201 Check FL5202 13dBm 2dB 3dBm 2dB 3dBm 2dB OV Check No No Yes Yes Yes B IF circuit at C5208 at TP13 DIFFERENCE BETWEEN IN OUT DIFFERENCE BETWEEN IN OUT DIFFERENCE BETWEEN IN OUT U5201 on Y5211 at 44 645MHz on FL5201 IN OUT at 455KHz circuit circuit Y5211 circuit control circuit DC circuit circuit TP14 C5251 Is RF level on FL5202 IN OUT at 455KHz No ...

Page 61: ...R PENDULUM Start Is 2 1 MHz Replace R5731 Check C5733 and R5715 Replace U5702 Replace L5700 Check L5704 Replace U5703 Replace U5700 Check C5738 C5724 C5713 L5709 Is 16 8 MHz Is 5V present at U5700 13 Is 5V present at L5700 Is 5V present at U5703 2 Is 9 3V present at U5703 1 Is 16 8MHz present at U5700 10 at R5731 present at U5700 10 present Yes Yes Yes Yes Yes Yes No No No Yes No No No No at C5700...

Page 62: ...oting 8 5 Troubleshooting Flow Chart for Synthesizer cont NO Tx INJECTION Start Is 5V present at Q5707 C Check Q5707 Is 2 1 MHz present at R5731 DC circuit Check Q5701 and Q5705 DC circuits Check RF path line up ...

Page 63: ...Is synt out Go to controller U6501 DC voltages Pin 2 9 1V during Tx only Pins 3 and 4 A 0 1V No No No No No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes OK control head troubleshooting 5V at Is there K9 1 ENB troubleshooting 9 3V at Q0741 or Q0742 Replace Q0741 and Q0742 synthesizer troubleshooting troubleshooting PA_ENABLE PA_PWR_SET at U0702 2 there 2V or software Is ther...

Page 64: ...ry With power connected to radio and the radio turned on check the following 1 5 V at pin 1 of U631 and pin 71 12 31 41 of U0101 2 Check for 14 7456 MHz at pin 73 of U0101 3 Check DC at pin 75 of U0101 If 4 5V DC check TP0200 for 2 1 MHz signal 4 Check for typical voltages of U0101 and U0201 beep present turn on present Done Done Done Yes Yes Yes Yes No Don t know No No No Are alert tones enabled ...

Page 65: ...D U0932 Q0953 and ZEBRA connectors Check U0941 Q0942 4 D0942 4 Check R915 922 R955 and R958 Do the LEDs light Check U0942 and U0970 Is backlight OK Is volume OK Check U0941 Q0951 Q0952 D0951 D0970 Is keypad OK Is the display on Is SPI communication OK End Yes No Yes Yes Yes No Yes Yes No No No No ...

Page 66: ...May 1996 68P02945C70 O 1 SCHEMATIC DIAGRAMS CIRCUIT BOARD DETAILS PARTS LISTS ...

Page 67: ...M_OUT 30 SQ_NOISE 15 32 DEMOD_FILT 31 DEMOD_OUT 14 DRIVE 1 GND 26 ICO_TUNE 3 IF_AMP_IN 36 MIXER_OUT 9 OSC_FB 10 OSC_OUT 6 PREAMP_IN 5 PREAMP_OUT 19 RIPPLE_FILT RSSI_BYP 25 11 R5401 51 SQ_OUT 20 SQ_RECT_IN 16 SQ_TAIL_TC 27 T_R L5402 C5404 27pF 0 47M C5200 22pF L5401 0 47M 820 13pF C5212 36pF C5213 16pF C5211 3 9pF C5214 R5211 5 6k R5212 1500pF C5224 0 47uF C5231 4 7uF C5227 10uF C5251 130k R5221 R5...

Page 68: ...66 AUX_IN 2 AUX_OUT 5 GND 1 NC 39pF C5767 39pF U5705 RHOM_FMC_2 3 V 4 22nF C5768 C5742 C5763 0 1uF C5727 R5742 39pF V 3 AUX_IN 4 AUX_OUT 2 GND 5 NC 1 6 8k C5764 39pF RHOM_FMC_2 U5704 C5741 22nF 39pF C5765 C5728 0 1uF 1 0uH L5707 C5716 4 7uF 8V5 SW_RX SW_TX C5707 39pF C5702 0 1uF 51 R5736 330 C5706 39pF R5704 GND 2 3 GND 4 GND 6 GND 7 GND C5759 UPC1678G U5701 L5706 1 5 VCC 8 39pF L5705 150nH C5760 ...

Page 69: ...100 1 8pF C6542 1 8pF L6518 100 R6531 L6508 C6540 7 66nH RHOM_FMC_2 U6502 23 75nH GND 5 NC 1 1000pF 3 3pF 220 V 3 AUX_IN 4 AUX_OUT 2 C6524 C6525 L6513 7 66nH R6555 VR6501 MMBZ5244L L6506 L6509 68nH 68nH L6514 39pF C6543 0 1uF C6546 0 1uF C6507 0 1uF C6544 C6550 0 1uF C6545 39pF C6549 0 1uF 68nH L6515 R87151 C6534 CR6509 R6539 SMBV1032LTI 39pF 47 C6526 CR6504 39pF C6529 R6515 3 3k 10pF CR6506 R8715...

Page 70: ...F 4 7k R0715 100 R0714 R0732 U0702 CLOCK 10 DIN 1 DOUT 15 ENABLE_ 6 NC1 8 NC2 9 Q1 OUT 2 Q2 OUT 4 13 R1 OUT 3 R2 OUT 5 R3 OUT 12 R4 OUT 14 VDD 16 VSS 7 39pF MC144111 C0703 R0742 1 5k Q3 OUT 11 Q4 OUT R0703 10k 1 5k R0741 R0713 510 510 R0710 39pF C0722 C0741 R0726 10k 39pF C0723 39pF 3904L C0725 39pF NPN Q0731 R0743 Q0742 DTC144EK GND IN OUT 1k 0 1uF Q0741 R0712 TSTP IF2_3 IF_IN2 IF_IN1 IF3_4 IF_IN...

Page 71: ...CE DET_AUDIO EMER_IGN_SENSE EXTERNAL_ALARM FLT_A FLT_RX_AUDIO FRACN_CE GPI1 GPO1 HIGH_LOW_BAND HOOK_RSS INT_SPKR INT_SPKR K9V1_ENABLE LOCK_DET MIC MOD_IN REAR_PTT RESET RSSI RSSI_BUF RX_AUDIO SCI_TX SPI_CLCK_SRC SPI_CLK SPI_DATA SPI_DATA_SRC TEMP USW_ 5V_CL VAG EXT_MIC FAST_OFF_IGN FLAT_TX_AUDIO 9V3 AUDIO_PA_ENABLE B _CONTROL BUS EMERGENCY_CONTROL EMER_IGN_SENSE EXTERNAL_ALARM EXT_MIC FAST_OFF_IGN...

Page 72: ...G_1 10 INT_SPKR PTT 2 INT_SPKR 1 4 LCD_CE_BUF 15 8 FLT_A 9 17 BUS 5V 2 33pF C0233 0 16 3 0 15 2 3 1 68HC11K1_QFP 68HC11K4_TAU U0101 14 E 72 EXTAL 73 IRQ 61 MODA_LIR 77 76 MODB_VSTBY 11 17 8 PA3_IC4_OC5 PA4_OC4_OC1 7 6 PA5_OC3_OC1 5 PA6_OC2_OC1 4 PA7_PA1_OC1 21 41 AVDD AVSS 52 18 PB3_ADDR11 PB4_ADDR12 17 16 PB5_ADDR13 15 PB6_ADDR14 14 PB7_ADDR15 62 PA0_IC3 PA1_IC2 10 9 PA2_IC1 65 66 PC4_DATA4 67 PC...

Page 73: ...EE C0404 VR0480 C0401 47uF C0419 47uF 0 47uF 0 1uF C0418 51 R0418 100k R0419 100k R0417 4 7k R466 L413 BEAD L435 L415 BEAD BEAD L416 BLM21A05 L412 C0409 BLM21A05 L414 BLM21A05 0 1uF C0408 01uF R0412 C0407 01uF 4 7K 560 R0421 10k R0411 7 INT_SPK GND SW_B 13 GROUND 5 FLAT_RX_AUDIO 11 EXTERNAL_PTT FLAT_TX_AUDIO EXT_SPKR 3 EXTERNAL_MIC_AUDIO HOOK 14 EXT_SPKR 1 EXTERNAL_ALARM 2 RSSI_BUF 15 16 GPI O 12 ...

Page 74: ...0 C5311 C5312 C5322 C5323 C5324 C5325 C5404 5 12 23 30 C6520 C6523 C6525 C6526 C6527 C6529 C6545 C6546 CR6503 CR6504 CR6506 CR6509 D5201 L5203 L5211 L5302 L5321 L5322 L5401 L5402 L6509 L6511 Q5301 R5207 R5211 R5212 R5223 R5224 R5231 R5241 R5306 R5311 R5312 R5321 R5322 R5323 R5324 R5325 R5326 R5327 R5328 R5401 R6514 R6515 R6537 SH5201 SH5202 U5201 U5211 ...

Page 75: ...25 NPO 100V C6553 2111078A17 RF 3 3 0 25 NPO 100V diodes See Note 1 CR150 151 600 4813833C02 dual 70V common cathode CR721 CR5700 4802233J09 triple SOT143 RH CR5701 5702 4862824C01 varactor CR6501 4813833C02 dual 70V common cathode CR6502 6503 4802482J02 pin diode SMD CR6504 4805129M96 dual REFERENCE MOTOROLA DESCRIPTION SYMBOL PART NO CR6506 4805218N57 dual CR6508 4880222R01 reverse polarity CR65...

Page 76: ...2 R5756 5757 0662057A35 270 R6502 0662057A09 22 R6503 0662057A01 10 R6504 0662057A42 510 R6506 0662057A09 22 R6512 0662057A25 100 R6514 6515 0662057A61 3300 R6519 0680361L01 thermistor 47K R6520 1705603W01 SMT shunt R6523 6525 0662057A53 1500 R6526 0662057A01 10 R6527 0662057A36 300 R6531 6532 0662057A25 100 R6537 6539 0662057A17 47 R6555 0662057A33 220 shields SH5201 2605261V01 shield Z1F SH5202 ...

Page 77: ...al filter Y5211 4880008K02 resonator 44 645MHz Qty non referenced items D101 102 200 4813833C02 dual 70V common cathode D441 611 621 D631 D5201 5303 4880154K03 dual Schottky mixer 1 8408029Y34 PCB 1 8408029Y01 PCB Notes 1 For optimum performance diodes transistors and integrated circuits must be ordered by MOTOROLA part numbers 2 When ordering quartz crystal units or ceramic resonators specify car...

Page 78: ...03 VOLUME UP J0901 ON OFF CALL VOLUME DOWN MON MENU ON_OFF_CONTROL NU 200k R981 22 VDD 2 VSS C2 C3 NC I5 A3 B7 B1 I1 B2 B3 A5 A6 T1 I4 I3 I2 A2 A1 I6 I7 A7 I8 T3 C4 C5 C6 B4 B5 T2 B6 A4 C7 C1 COM FLT_A NU 0 R980 R0941 18 1 21 OSC IN 20 OUTPUT_B 1 10k 42 OUTPUT_B 20 41 OUTPUT_B 21 OUTPUT_B 22 40 39 OUTPUT_B 23 38 OUTPUT_B 24 U0932 MC145453 27 BACKPLANE IN 26 BACKPLANE OUT 24 CLOCK IN 25 DATA IN 28 ...

Page 79: ...U61 LCD driver U941 5113806A35 regulator 8 stage shift store U942 1805642V01 volume potentiometer ON OFF REFERENCE MOTOROLA DESCRIPTION SYMBOL PART NO U970 5113818A03 high performance single supply Zener diodes See Note VR901 904 4813830A27 14V 5 225mW MMBZ5244B VR906 907 VR908 4813830A14 5 1V 5 225mW MMBZ5231 VR993 4813830A27 14V 5 225mW MMBZ5244B Qty non referenced items D941 942 4805729G73 LED ...

Page 80: ...402618Y01 flexible circuit 12 3202620Y01 control head gasket 13 7202631Y01 LCD display 14 2802638Y01 connector 15 2802638Y02 connector 16 0780360K01 LCD frame 17 2780354K01 chassis 18 FCC label 19 FLF5582 main board 20 2680519K01 PA shield 21 0310907A20 mechanical screw M3x0 5x10 22 4205938V01 clip spring 23 2680439K01 cover shield 24 3202619Y01 pad 25 1580355K01 cover assembly 26 FHN5875 accessor...

Page 81: ...402618Y01 flexible circuit 12 3202620Y01 control head gasket 13 7202631Y01 LCD display 14 2802638Y01 connector 15 2802638Y02 connector 16 0780360K01 LCD frame 17 2780354K01 chassis 18 FCC label 19 FLF5582 main board 20 2680519K01 PA shield 21 0310907A20 mechanical screw M3x0 5x10 22 4205938V01 clip spring 23 2680439K01 cover shield 24 3202619Y01 pad 25 1580355K01 cover assembly 26 FHN5875 accessor...

Page 82: ...eld 1 2780354K01 chassis 1 3202606Y01 accessory connector gasket 1 3202620Y01 control head gasket 2 3280494K01 speaker pad 2 4205938V01 spring clip FLN8531A Control Head Hardware REFERENCE MOTOROLA DESCRIPTION SYMBOL PART NO Qty non referenced items 1 8402618Y01 flexible cable 1 0780360K01 LCD frame 1 1580356K01 housing 1 2802638Y01 elastomeric 1 2802638Y02 elastomeric 1 3202630Y01 LCD frame gaske...

Page 83: ... Did this Service manual provide you with the information necessary to service and maintain the specific equipment very much so generally yes to some extent no 4 How do you rate this particular Service Manual excellent very good good fair poor 5 We would appreciate any corrections or recommendations for improving this manual Please include the specific page number s of the diagram or procedure in ...

Page 84: ...ts List Page No __________ 6 General comments suggestions Name Company Customer COSC MSS FTR Other Address City State Zip Phone Number Please include Area Code PLEASE USE TAPE TO SEAL POSTAL REGULATIONS PROHIBIT USE OF STAPLES NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST CLASS MAIL PERMIT NO 9040 FT LAUDERDALE FL POSTAGE WILL BE PAID BY ADDRESSEE Attention Technica...

Search results

Summary of Contents for GTX

Reviews:

Related manuals for GTX

Brands by name

Popular brands

Motorola GTX, Service Manual

Search results

Summary of Contents for GTX

Reviews:

Related manuals for GTX

Brands by name

Popular brands